bashar assad's power base. rebels have been trying to supply lines, as the bullets fly behind the scenes a political maneuvering continues. ourselves hillary clinton met yesterday with her russian counterpart and the united nations peace envoy to discuss the next steps for syria. the united states has insisted president assad must go. the russians have been against the idea. the u.s. is not going to cause budge on this one the yatsd stands with the american people in insisting that process result in a unified democratic syria. and a future of this kind cannot possibly include assad. >> makes the issue much more complex at least five different cities. u.s. officials say the syrians have already mixed the components for the deadly chemical weapon saran gas. the question remains whether he plans to use saran gas for murder against his own people. do u.s. officials say that they think that he would actually do this? >> well, behind the scenes, they appear to be quite worried. the president, defense secretary and se